Avoid:

  The Panel encountered a problem while loading
  "ClockAppletFactory::ClockApplet" Do you want to delete the applet
  from your configuration?

Solution:

  https://mail.gnome.org/archives/commits-list/2012-May/msg05607.html

While here, depend on sysutils/desktop-file-utils/desktopdb.mk
Updated x11/gnome-panel to 2.32.1nb41
Improve documentation.
MASTER_SITES moved.
Fix packaging with py-setuptools-0.8.
MASTER_SITES directory is one level down now.
HOMEPAGE was Forbidden(403) Status, stip the last leaf from its URL.